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Series modular conversion device

A converter device, modular multi-level technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of increasing the peak current of the converter

Pending Publication Date: 2020-06-16
HITACHI ENERGY SWITZERLAND AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this reduction may increase the peak current through the converter and is therefore undesirable

Method used

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Embodiment Construction

[0049] Hereinafter, a detailed description will be given of preferred embodiments of the present invention.

[0050] figure 1 A first converter device 10 is shown connected to a second converter device 12 via a direct current (dc) link 14 comprising a first pole P1 and a ground connection GR. The first converter device 10 is also connected to a first alternating current (ac) system or grid 16 .

[0051] The first converter device 10 is arranged for converting between ac and dc, and is composed of or includes a plurality of voltage source converters (VSC), the plurality of voltage source converters (VSC) The converter is realized as a modular multilevel converter (MMC) and is thus composed of sub-modules.

[0052] The second converter device 12 can likewise be implemented using a VSC, possibly in the form of an MMC. However, it can also be formed as one or more current source converters (CSC). The dc link 14 may comprise at least one dc pole P1 and optionally also a ground ...

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Abstract

The embodiment of the invention relates to a series modular conversion device. The conversion device comprises a first dc connection point, a second dc connection point, a first string of modular multilevel converters, and a plurality of transformers; the first string of modular multilevel converters is connected between the points and includes at least one first converter connected to the first dc connection point, wherein each converter includes an ac terminal set of each phase provided by an ac system; and the plurality of transformers include at least one transformer connected to the firststring of converters; the ac terminal set of each converter is connected to a corresponding first set of star-connected transformer windings, wherein the first set of transformer windings is magnetically coupled to a corresponding second set of transformer windings. A first bypass module associated with the first converter is adopted; the first bypass module is connected between the connection point and the neutral point of a first number of star-connected windings connected to the ac terminals of the first converter; and the module includes a thyristor that is triggered upon the detection ofa fault between the first converter and the corresponding first set of windings.

Description

technical field [0001] The present invention relates to a converter device for converting current between direct current and alternating current, and to a method for dealing with internal faults of the converter device. Background technique [0002] The use of modular multilevel converters (MMCs) in many different fields and topologies has become of interest. For example, it is of interest to provide a converter device that uses MMCs for converting between alternating current (ac) and direct current (dc). To provide such an arrangement, a plurality of converters may be connected in string between two DC connection points of the dc link, one of which is the connection point to a pole of the dc link , and wherein each converter can be additionally connected to the ac system respectively. [0003] In such converters, the internal ac connections may be subject to failure. Therefore there may be an ac fault within the converter. This fault can be especially harmful for the co...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/32
CPCH02M7/483H02M1/32
Inventor K·伊尔维斯冈崎佑平M·安德森
Owner HITACHI ENERGY SWITZERLAND AG
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